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Add string -> number conversion for preproc expression evaluator Q&D conversion from string to signed number. It should be noted that this really should be done during tokenization and the type of number be set by the tokenizer, including parsing floating point values. Then the preprocessor can decide what to do with non-integer numbers.
author William Astle <lost@l-w.ca>
date Sun, 15 Sep 2013 14:22:10 -0600
parents 02804b7c051c
children 8764142b3192
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 /*
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2 pass6.c
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3
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4 Copyright © 2010 William Astle
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5
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6 This file is part of LWTOOLS.
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7
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8 LWTOOLS is free software: you can redistribute it and/or modify it under the
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9 terms of the GNU General Public License as published by the Free Software
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10 Foundation, either version 3 of the License, or (at your option) any later
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11 version.
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12
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13 This program is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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16 more details.
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17
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18 You should have received a copy of the GNU General Public License along with
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19 this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #include <stdio.h>
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23 #include <string.h>
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24
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25 #include <lw_alloc.h>
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26 #include <lw_string.h>
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27
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28 #include "lwasm.h"
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29 #include "instab.h"
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30
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31 /*
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32 Finalize Pass
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33
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34 Reduce all expressions in a final pass.
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35
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36 Observation:
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37
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38 Everything should reduce as far as it is going to in a single pass
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39 because all line addresses are now constant (or section-base offset)
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40 */
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41
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42 static int exprok_aux(lw_expr_t e, void *priv)
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43 {
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44 asmstate_t *as = priv;
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45
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46 if (lw_expr_istype(e, lw_expr_type_int))
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47 return 0;
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48
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49 if (as -> output_format == OUTPUT_OBJ)
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50 {
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51 if (lw_expr_istype(e, lw_expr_type_oper))
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52 return 0;
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53 if (lw_expr_istype(e, lw_expr_type_special) && as -> output_format == OUTPUT_OBJ)
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54 {
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55 int t;
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56 t = lw_expr_specint(e);
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57 if (t == lwasm_expr_secbase || t == lwasm_expr_syment || t == lwasm_expr_import)
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58 return 0;
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59 }
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60 }
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61
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62 return 1;
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63 }
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64
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65 static int exprok(asmstate_t *as, lw_expr_t e)
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66 {
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67 if (lw_expr_testterms(e, exprok_aux, as))
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68 return 0;
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69 return 1;
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70 }
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72
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73 void do_pass6(asmstate_t *as)
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74 {
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75 line_t *cl;
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76 struct line_expr_s *le;
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77
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78 for (cl = as -> line_head; cl; cl = cl -> next)
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79 {
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80 as -> cl = cl;
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81 for (le = cl -> exprs; le; le = le -> next)
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82 {
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83 lwasm_reduce_expr(as, le -> expr);
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84 if (!exprok(as, le -> expr))
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85 {
160
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86 lwasm_register_error(as, cl, "Invalid expression: %s", lw_expr_print(le -> expr));
0
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87 }
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88 }
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89 }
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90 }